All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class javaParse.GrammarInfo 

java.lang.Object
   |
   +----javaParse.GrammarInfo
public class GrammarInfo
extends Object
implements Cloneable
allows users to add Productions as Strings and iterate over them, get the Variables, and get the Terminals.

Constructor Index

o GrammarInfo()
Allocates a new instance of class GrammarInfo.

Method Index

o addProduction(String)
o clone()
Creates a clone of the grammar.
o currentLeftProd()
Returns the current left side of the production.
o currentProd()
Returns the current production.
o currentRightProd()
Returns the current right side of the production.
o currentVar()
o firstProd()
Set the class production index to the first production in the grammar.
o firstVar()
Set the class variable index to the start symbol
o getNumProds()
o getNumVars()
o getRightProds()
o getStartSymbol()
o getTerminals()
o getVariables()
o hasStartProduction()
o isGoodGrammarInfo()
o isTerminal(char)
o isUnrestricted()
o isVariable(char)
o leftProdAt(int)
o nextProd()
Increment the production to the next production.
o nextVar()
Increment the variable to the next one, interates in alphabetical order, after starting with the Start Symbol
o prodsAllAdded()
lets the GrammarInfo organize itself, and sort everything since no more prods can be added once Done is called addProd does not check to see if this was called thus, another call to addProd will mess up sorted order that was previously guaranteed
o prodsDone()
Indicates if the production index is at the last production.
o rightProdAt(int)
o varsDone()

Constructors

o GrammarInfo 
 public GrammarInfo()
Allocates a new instance of class GrammarInfo.

Methods

o clone 
 public Object clone()
Creates a clone of the grammar.

Overrides:
clone in class Object
o prodsAllAdded 
 public void prodsAllAdded()
lets the GrammarInfo organize itself, and sort everything since no more prods can be added once Done is called addProd does not check to see if this was called thus, another call to addProd will mess up sorted order that was previously guaranteed

o isGoodGrammarInfo 
 public boolean isGoodGrammarInfo()
Returns:
s true if all productions produce a good GrammarInfo such that every variable begins its own production and every variable is also on the right hand side of the production Only the start symbol is allowed to appear on one side of Prod
o addProduction 
 public boolean addProduction(String prod)
Parameters:
p - production to be added for exp, "S->aSb"
Returns:
true if it adds valid production to the grammar.
o firstProd 
 public void firstProd()
Set the class production index to the first production in the grammar.

o firstVar 
 public void firstVar()
Set the class variable index to the start symbol

o nextProd 
 public void nextProd()
Increment the production to the next production.

o nextVar 
 public void nextVar()
Increment the variable to the next one, interates in alphabetical order, after starting with the Start Symbol

o currentLeftProd 
 public String currentLeftProd()
Returns the current left side of the production.

o currentRightProd 
 public String currentRightProd()
Returns the current right side of the production.

o currentProd 
 public String currentProd()
Returns the current production.

o currentVar 
 public String currentVar()
Returns:
the current variable
o prodsDone 
 public boolean prodsDone()
Indicates if the production index is at the last production.

o varsDone 
 public boolean varsDone()
Returns:
true if the last variable has already been touched
o leftProdAt 
 public String leftProdAt(int pos)
Parameters:
pos - the index in the String 1 < pos <= TotalNumberOfProductions
Returns:
the left side Production in the Grammar Note: used for LR
o rightProdAt 
 public String rightProdAt(int pos)
Parameters:
pos - the index in the String 1 < pos <=hTotalNumberOfProductions
Returns:
the right side of the production at a certain pos Used for LR
o getStartSymbol 
 public String getStartSymbol()
Returns:
the start symbol for the grammar
o getNumProds 
 public int getNumProds()
Returns:
the number of productions in the grammar
o getNumVars 
 public int getNumVars()
Returns:
the number of different variables in the grammar
o getVariables 
 public String[] getVariables()
Returns:
String[] of Variables such that the first element is the starting variable and the rest are all alphabetized: "A" - "Z" is a variable
o getRightProds 
 public String[] getRightProds()
Returns:
a String[] containing the Rhs of the grammar in the original order
o getTerminals 
 public Vector getTerminals()
Returns:
a sorted Vector of terminals where a terminal is "a"- "z" and other misc terminal chars
o hasStartProduction 
 public boolean hasStartProduction()
Returns:
true if S-> has been added somewhere to the GrammarInfo
o isUnrestricted 
 public boolean isUnrestricted()
Returns:
true if the grammar is unrestricted
o isTerminal 
 public boolean isTerminal(char c)
Returns:
true if c is a Terminal (even if it is not a Terminal in this GrammarInfo)
o isVariable 
 public static boolean isVariable(char c)
Returns:
true if c is a Variable (even of it is not a Variable in this GrammarInfo 
All Packages  Class Hierarchy  This Package  Previous  Next  Index